An isotropically elastic medium carries pressure (P) and shear (S) wave speeds that are conformally Euclidean metrics.
Of these two the P-waves are faster [1]}.
In order to be true to the isotropic elasticity we should measure both P- and S-wave arrivals.
In this paper we simplify this aspect of the problem by disregarding polarizations and considering only one type of isotropic waves.
